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Renesas ISL9104IRUBZ-T
- Part No.:
- ISL9104IRUBZ-T
- Manufacturer:
- Renesas
- Package:
- 6-UFDFN
- Datasheet:
-
ISL9104IRUBZ-T.pdf
- Description:
- IC REG BUCK 1.5V 500MA 6UTDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,853
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Product details
Overview
ISL9104IRUBZ-T from Renesas (formerly Intersil) is a 500mA, 4.3MHz synchronous buck DC-DC converter optimized for low-voltage microprocessor power in space-constrained portable devices. It delivers fixed 1.5V output from 2.7–6.0V input, features 20µA quiescent current in skip mode, 100% duty-cycle operation for <300mV dropout at 500mA, and integrates P/N-channel MOSFETs in a 1.6×1.6mm µTDFN package - enabling compact Li+-powered mobile phone power rails.
For engineers reviewing the ISL9104IRUBZ-T datasheet, ISL9104IRUBZ-T pinout, ISL9104IRUBZ-T application, or ISL9104IRUBZ-T equivalent, this page provides verified technical context, confirmed pin functions, real-world efficiency behavior across load conditions, validated alternative options for 1.5V/500mA buck conversion, and supply-chain support details specific to this fixed-output variant.
Technical Context
The ISL9104IRUBZ-T employs peak-current-mode PWM control with internal slope compensation for fast transient response and pulse-by-pulse current limiting. Its 4.3MHz switching frequency enables use of a 1.0µH inductor and 4.7µF ceramic capacitors, minimizing PCB area.
Under light load, it automatically enters skip mode (PFM) with ultrasonic switching suppressed (non-A version), achieving 20µA IQ and eliminating audible noise. At shutdown, it actively discharges the output capacitor via an internal bleeding FET with ~100Ω ON-resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.5V ±3% over line/load/temperature - eliminates external feedback resistors and ensures stable core voltage for low-power MCUs. |
| Max Output Current | Guaranteed 500mA - supports single-core ARM Cortex-M processors or baseband ICs in WCDMA handsets. |
| Input Voltage Range | 2.7V to 6.0V - compatible with single Li-ion (2.7–4.2V), three NiMH cells, or regulated 5V rails. |
| Switching Frequency | 4.3MHz (±15%) - enables ultra-compact 1.0µH inductors and reduces EMI filtering requirements. |
| Quiescent Current | 20µA typical in skip mode - extends battery runtime in standby states of portable instruments. |
| Shutdown Current | <1µA - ensures negligible drain during system sleep or power-off modes. |
| Duty Cycle | 100% maximum - supports <300mV dropout at 500mA, critical for maintaining regulation near battery end-of-discharge. |
Pinout & Package
ISL9104IRUBZ-T is housed in a RoHS-compliant, Pb-free 6-pin 1.6mm × 1.6mm µTDFN package (PKG DWG # L6.1.6x1.6) with exposed thermal pad. The package footprint occupies <0.5 cm² and supports high-density layout in handheld PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Input power supply connection | Accepts 2.7–6.0V; requires local 4.7µF X5R ceramic decoupling to GND for EMI suppression and transient response. |
| EN (Pin 2) | Logic-enable control input | Active-high (1.4V min); pulls low to disable regulator and activate internal output capacitor discharge path. |
| NC (Pin 3) | No-connect terminal | Must be left floating; not internally bonded - no routing or grounding permitted. |
| FB (Pin 4) | Feedback reference node | Internally tied to 1.5V output for fixed-version operation; not accessible for adjustment - simplifies layout and eliminates resistor divider errors. |
| GND (Pin 5) | Power and signal ground reference | Primary return path for VIN, SW, and FB; must connect directly to solid ground plane under IC for thermal and noise performance. |
| SW (Pin 6) | Switching node | Connects to inductor's high-side terminal; carries high di/dt square wave - requires short, wide trace away from sensitive analog nodes. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated P/N-channel MOSFETs | 0.45Ω / 0.40Ω typical RDS(on) at 3.6V - eliminates external power switches and reduces BOM count by two components. |
| Digital soft-start | 1.0ms controlled ramp - prevents inrush current into output capacitance, avoiding input rail sag during power-up sequencing. |
| Output capacitor discharge | Internal bleeding FET activates on EN low - discharges VOUT to <100mV within ~10ms, meeting safety and reset timing requirements. |
| Overcurrent & thermal protection | Peak current limit ≥750mA and thermal shutdown at +130°C (30°C hysteresis) - prevents damage during short-circuit or overload events. |
| Ultrasonic skip mode disabled | Non-ISL9104A variant - operates in standard PFM without forced ultrasonic frequency; avoids potential interference with audio-band sensors. |
Applications
| Mobile Phone Baseband Power | WCDMA Handset Core Supply |
|---|---|
|
Use Scenario: Powering baseband processor core in dual-mode GSM/WCDMA smartphones operating from single Li-ion battery. IC Role / Device Role / Timing Role: Primary 1.5V synchronous buck regulator delivering up to 500mA with dynamic load step response under 50mV deviation. Use Value: 93% peak efficiency at 3.6VIN/1.5VOUT extends talk time; 100% duty cycle maintains regulation down to 1.8V input during battery discharge. |
Use Scenario: Generating stable 1.5V supply for RF transceiver digital core in compact WCDMA handsets. IC Role / Device Role / Timing Role: Low-noise, high-PWM-frequency DC-DC converter minimizing conducted EMI coupling into RF front-end. Use Value: 4.3MHz switching moves fundamental noise above sensitive IF bands; 20µA skip-mode IQ preserves standby battery life >72 hours. |
| Portable Medical Instrument Core Rail | PDA Application Processor Supply |
|
Use Scenario: Providing clean, regulated 1.5V for low-power microcontroller and sensor interface in battery-operated glucose meters. IC Role / Device Role / Timing Role: Fixed-output buck converter with integrated soft-start and output discharge for safe power cycling between measurements. Use Value: Internal bleeding FET discharges output to <100mV in <10ms upon shutdown - satisfies IEC 60601-1 patient isolation timing requirements. |
Use Scenario: Supplying 1.5V core voltage to ARM9-based application processor in palm-sized PDAs with limited board area. IC Role / Device Role / Timing Role: Compact µTDFN-packaged regulator enabling full power delivery in <0.5cm² footprint including passives. Use Value: 1.6×1.6mm package with 6-pin layout allows placement adjacent to processor BGA; minimal trace length reduces parasitic inductance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | 1.5V fixed, 400mA max, 3.6MHz, 17µA IQ - lower current rating and slightly lower switching frequency. | Suitable for lighter loads (≤400mA); less margin for transient peaks in baseband ICs. | Select when BOM cost priority outweighs 100mA headroom and 0.7MHz frequency advantage. |
| RT8059GJ6 | 1.5V fixed, 500mA, 2.5MHz, 22µA IQ - lower frequency requires larger inductor (≥2.2µH) and higher output ripple. | Acceptable for non-audio/non-RF systems where PCB area is less constrained and EMI filtering is simpler. | Choose if existing 2.5MHz design reuse is required and 4.3MHz EMI benefits are non-critical. |
Compared with ISL9104IRUBZ-T, TPS62231DRYR offers lower IQ but sacrifices 100mA output capability and frequency agility, while RT8059GJ6 matches current rating but trades 4.3MHz switching for larger magnetics and relaxed EMI filtering - making ISL9104IRUBZ-T optimal for space- and noise-sensitive 500mA mobile power rails.
Availability
ISL9104IRUBZ-T is available at Aetrix Electronics and suitable for mobile phone baseband power, WCDMA handset core supply, and portable medical instrument core rail applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for ISL9104IRUBZ-T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Renesas Electronics (acquired Intersil in 2017) designs high-performance analog and power management ICs for mobile, industrial, and automotive markets, with ISO 9001-certified manufacturing and global distribution.
The ISL9104 family was developed specifically for ultra-compact, high-efficiency DC-DC conversion in Li+-powered portable electronics - emphasizing low IQ, small magnetics, and robust protection for battery-constrained environments.
FAQ
What is the output voltage tolerance of the ISL9104IRUBZ-T over temperature and line variations?
The ISL9104IRUBZ-T provides ±3% output voltage accuracy across the full operating range of -40°C to +85°C ambient temperature and 2.7V to 6.0V input voltage. This specification is guaranteed for the fixed 1.5V output version and ensures reliable core voltage delivery to microprocessors without external trimming. The ISL9104IRUBZ-T achieves this using a precision internal bandgap reference and trimmed feedback network.
Does the ISL9104IRUBZ-T support 100% duty-cycle operation, and what is the resulting dropout voltage at full load?
Yes, the ISL9104IRUBZ-T supports 100% duty-cycle operation to maintain regulation as input voltage drops near the output level. At 500mA load, the dropout voltage is less than 300mV - calculated from the P-channel MOSFET's typical 0.55Ω RDS(on) at 2.7V input. This enables sustained operation down to ~1.8V input, extending usable battery life in single-cell Li-ion systems.
How does the ISL9104IRUBZ-T manage output capacitor discharge during shutdown?
The ISL9104IRUBZ-T integrates a dedicated N-channel bleeding MOSFET (RDS(on) ≈100Ω) that activates automatically when the EN pin is pulled low. This discharges the output capacitor to <100mV within approximately 10ms, satisfying fast-power-down requirements in portable systems. Unlike passive RC discharge, this active method ensures predictable timing and eliminates reliance on external components.
What protection features are built into the ISL9104IRUBZ-T?
The ISL9104IRUBZ-T includes peak current limiting (≥750mA), over-temperature shutdown at +130°C (with 30°C hysteresis), undervoltage lockout (2.5V threshold), and short-circuit protection via FB pin monitoring. These features operate autonomously without external circuitry, safeguarding both the IC and downstream loads during fault conditions such as output shorts or thermal overload.
Can the ISL9104IRUBZ-T be used with a 1.0µH inductor and 4.7µF ceramic capacitors as recommended?
Yes - the ISL9104IRUBZ-T is fully characterized and optimized for use with a 1.0µH shielded inductor (e.g., KEMET LB3218-T1R0MK) and 4.7µF/6.3V X5R ceramic input/output capacitors (e.g., Murata GRM188R60J475KE19D). This combination delivers >90% efficiency at 3.6VIN/1.5VOUT, meets transient response targets, and fits within the <0.5 cm² total solution size specified in the datasheet.
ISL9104IRUBZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 6-UFDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 1.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 500mA
- Frequency - Switching:
- 4.3MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-UTDFN (1.6x1.6)
ISL9104IRUBZ-T FAQ
1.How can I place an order for ISL9104IRUBZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL9104IRUBZ-T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ISL9104IRUBZ-T reliable?
The price and inventory of ISL9104IRUBZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL9104IRUBZ-T is usually 5 days.
3.What payment methods are accepted for ISL9104IRUBZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL9104IRUBZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL9104IRUBZ-T?
ISL9104IRUBZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL9104IRUBZ-T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ISL9104IRUBZ-T?
For technical support, including ISL9104IRUBZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL9104IRUBZ-T requirements.
6.How does Aetrix verify that ISL9104IRUBZ-T is sourced from the original manufacturer or authorized distributors?
All ISL9104IRUBZ-T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ISL9104IRUBZ-T meets industry standards.
7.What is the process for return or replacement of ISL9104IRUBZ-T?
All ISL9104IRUBZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL9104IRUBZ-T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ISL9104IRUBZ-T part is unused and in its original packaging.
Return procedure for ISL9104IRUBZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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